mojo: handle WM_DELETE_WINDOW in native_viewport_x11

BUG=none
R=darin@chromium.org

Review URL: https://codereview.chromium.org/324823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276745 0039d316-1c4b-4281-b951-d872f2087c98

mojo/services/native_viewport/native_viewport_x11.cc

@@ -120,7 +120,7 @@ class NativeViewportX11 : public NativeViewport,
       case MotionNotify:
         return true;
       case ClientMessage:
-        return event->xclient.message_type != atom_wm_protocols_;
+        return event->xclient.message_type == atom_wm_protocols_;
       default:
         return false;
     }